The Duke and Duchess of Cambridge's first baby has been named George Alexander Louis and the baby will be known as His Royal Highness Prince George of Cambridge.

But what's in the three names?

Of the three names, the third's significance is most obvious. Louis immediately makes one think of Louis Mountbatten, uncle of Prince Philip and last viceroy of India.

His father Prince Louis of Battenberg was Prince William's great-great-grandfather. Louis is also one of William's middle names.

If Louis honors one side of the Royal Family, George clearly resonates with the other.

Despite St George being the patron saint of England, it took the arrival of a German king, George I, to cement the name's place in England. Long a popular name in Germany, it has Greek roots which means "farmer".

There have since been five other Georges to sit on the throne.

The most recent Georges reigned through two world wars. It was George V who declared war on Germany in 1914. George V recognised the strength of anti-German feeling and changed the Royal Family's name from the House of Saxe-Coburg and Gotha to the more English sounding Windsor.

It was his son George VI whose struggles with his stutter are so movingly depicted in The King's Speech. Christened Albert and known to his family as Bertie, but crowned as George, he's a reminder that the monarch has the final say on their regnal name.

On the other hand, Alexander has never been the name of a king of England or the UK, but was borne by three kings of Scotland.

Yet the most famous Alexander should be Alexander the great.

Alexander the Great famously conquered much of the known world and is often described as the best general ever to live. But he only made it to the age of 32 before either ill health or well-disguised murder did for him.

The two other rulers of Macedon to bear this name were both murdered but that has not stopped the name being popular with rulers down the ages.